audio-speech

Mirelo

Name: Mirelo
Availability: InStock
Author: AI Demos

Best overall choice for automatically adding scene-matched sound effects to uploaded videos, especially when you can refine prompts and compare variants.

3 tested videos4 output variantsFree SFX downloadsWatermarked video export

TL;DR — our verdictUpdated July 2026 · 18 test artifacts

Strongest overall in the test set

Where it wins

You want automatic SFX on uploaded videos and can compare multiple variants.
You want to rescue a weak first pass with prompt refinement.
You want background music alongside effects in the same workflow.

Main limitation

You need a strong one-shot result with no iteration.

Pricing (verified plans)

Free tier Free

Strongest test artifacts

Automatic Sound-Effect Generation →OUTPUT →Multi-Variant Output Generation →

Our take

Mirelo was the strongest overall tool in this set. It was especially impressive on the horror scene, produced a standout near-perfect bird/nature sync variant, and improved sharply on the product reveal after prompt refinement. The tradeoff is that the first automatic pass can be weak and free-plan video exports are watermarked, so it works best when you can compare variants and iterate.

Screen recording demo of Mirelo's workflow.

In-Depth Review

Our detailed analysis of Mirelo — features, performance, and real-world testing.

AI Demos Team

Expert Reviewer

Verified Review

Feature-by-Feature Breakdown

Automatic Sound-Effect Generation

Mixed first pass, strong ceiling

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Test Summary

Feature tested: Automatic Sound-Effect Generation

Result: Partial — Mixed first pass, strong ceiling

Automatically analyzes uploaded videos and places scene-matched sound effects. The evidence covers product-reveal, bird/nature, and horror-scene inputs, including footsteps, approach audio, atmosphere, and near-perfect sync in the nature clip.

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The first automatic pass on the product-reveal video was weak and not well matched to the visuals.

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On the bird/nature clip, one variant synced tightly enough to feel like on-location audio.

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On the horror scene, the tool generated detailed effects for footsteps, approach audio, and atmosphere; the batch was described as strong across all four variants.

Bottom Line

Strongest when the scene is clear or atmospheric, but the first automatic take can miss enough that iteration matters.

From our researchearlier researchAutomatically Add Relevant Sound Effects to Videos

Multi-Variant Output Generation

Useful, but output quality varies by take.

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Test Summary

Feature tested: Multi-Variant Output Generation

Result: Partial — Useful, but output quality varies by take.

Feature tested: Multi-Variant Output Generation

Result: Partial

Verdict: Useful, but output quality varies by take.

Expected behavior: Generates several alternative audio takes from the same uploaded video so users can compare outputs and pick the best one. The bird and horror tests showed multiple variants with quality differences, and the best result was not always first.

Test case: Video file → Video file

Input type: Video file

Input used: Input artifact (Video file): Input — Bird.mp4

Observed output: Output artifact (Video file): The highlighted bird/nature variant synced so tightly that it felt like part of the video. — mirelo-bird-chirping-output-2.mp4

Input artifact: Input artifact (Video file): Input — Bird.mp4

Output artifact: Output artifact (Video file): The highlighted bird/nature variant synced so tightly that it felt like part of the video. — mirelo-bird-chirping-output-2.mp4

What changed: Video file transformed into Video file

Test case: Video file → Video file

Input type: Video file

Input used: Input artifact (Video file): INPUT — Horror scene .mp4

Observed output: Output artifact (Video file): One of four generated variants from the horror scene; the report says all four were strong, which makes the multi-variant output especially useful. — mirelo-horror-output-2.mp4

Input artifact: Input artifact (Video file): INPUT — Horror scene .mp4

Output artifact: Output artifact (Video file): One of four generated variants from the horror scene; the report says all four were strong, which makes the multi-variant output especially useful. — mirelo-horror-output-2.mp4

What changed: Video file transformed into Video file

Test case: Video file → Video file

Input type: Video file

Input used: Input artifact (Video file): INPUT — Horror scene .mp4

Observed output: Output artifact (Video file): One of four horror variants. Unlike the bird test, the reviewer said all four horror outputs were strong. — mirelo-horror-output-3.mp4

Input artifact: Input artifact (Video file): INPUT — Horror scene .mp4

Output artifact: Output artifact (Video file): One of four horror variants. Unlike the bird test, the reviewer said all four horror outputs were strong. — mirelo-horror-output-3.mp4

What changed: Video file transformed into Video file

Test case: Video file → Video file

Input type: Video file

Input used: Input artifact (Video file): Input — Bird.mp4

Observed output: Output artifact (Video file): One of four simultaneous bird/nature variants; the report says the batch needed comparison because quality varied. — mirelo-bird-chirping-output-1.mp4

Input artifact: Input artifact (Video file): Input — Bird.mp4

Output artifact: Output artifact (Video file): One of four simultaneous bird/nature variants; the report says the batch needed comparison because quality varied. — mirelo-bird-chirping-output-1.mp4

What changed: Video file transformed into Video file

Test case: Video file → Video file

Input type: Video file

Input used: Input artifact (Video file): Bird / nature test video. — Bird.mp4

Observed output: Output artifact (Video file): Another bird/nature variant from the same four-output batch. — mirelo-bird-chirping-output-3.mp4

Input artifact: Input artifact (Video file): Bird / nature test video. — Bird.mp4

Output artifact: Output artifact (Video file): Another bird/nature variant from the same four-output batch. — mirelo-bird-chirping-output-3.mp4

What changed: Video file transformed into Video file

Test case: Video file → Video file

Input type: Video file

Input used: Input artifact (Video file): INPUT — Bird.mp4

Observed output: Output artifact (Video file): Another variant from the same four-output bird/nature batch. — mirelo-bird-chirping-output-4.mp4

Input artifact: Input artifact (Video file): INPUT — Bird.mp4

Output artifact: Output artifact (Video file): Another variant from the same four-output bird/nature batch. — mirelo-bird-chirping-output-4.mp4

What changed: Video file transformed into Video file

Test case: Video file → Video file

Input type: Video file

Input used: Input artifact (Video file): Product reveal test video. — Product reveal.mp4

Observed output: Output artifact (Video file): One of four product-reveal variants; comparison mattered because the initial automatic pass was weak. — mirelo-product-reveal-output-3.mp4

Input artifact: Input artifact (Video file): Product reveal test video. — Product reveal.mp4

Output artifact: Output artifact (Video file): One of four product-reveal variants; comparison mattered because the initial automatic pass was weak. — mirelo-product-reveal-output-3.mp4

What changed: Video file transformed into Video file

Test case: Video file → Video file

Input type: Video file

Input used: Input artifact (Video file): Product reveal test video. — Product reveal.mp4

Observed output: Output artifact (Video file): Another product-reveal variant from the same four-output batch. — mirelo-product-reveal-output-4.mp4

Input artifact: Input artifact (Video file): Product reveal test video. — Product reveal.mp4

Output artifact: Output artifact (Video file): Another product-reveal variant from the same four-output batch. — mirelo-product-reveal-output-4.mp4

What changed: Video file transformed into Video file

Test case: Video file → Video file

Input type: Video file

Input used: Input artifact (Video file): Input — Horror scene .mp4

Observed output: Output artifact (Video file): The horror batch was unusually consistent, with all four variants judged strong. — mirelo-horror-output-4.mp4

Input artifact: Input artifact (Video file): Input — Horror scene .mp4

Output artifact: Output artifact (Video file): The horror batch was unusually consistent, with all four variants judged strong. — mirelo-horror-output-4.mp4

What changed: Video file transformed into Video file

Why it matters / Conclusion: Helpful because you can compare takes, but the best result is not always the first one.

Generates several alternative audio takes from the same uploaded video so users can compare outputs and pick the best one. The bird and horror tests showed multiple variants with quality differences, and the best result was not always first.

video

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video

The highlighted bird/nature variant synced so tightly that it felt like part of the video.

video

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video

One of four generated variants from the horror scene; the report says all four were strong, which makes the multi-variant output especially useful.

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video

One of four horror variants. Unlike the bird test, the reviewer said all four horror outputs were strong.

video

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video

One of four simultaneous bird/nature variants; the report says the batch needed comparison because quality varied.

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Bird / nature test video.

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Another bird/nature variant from the same four-output batch.

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Another variant from the same four-output bird/nature batch.

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Product reveal test video.

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One of four product-reveal variants; comparison mattered because the initial automatic pass was weak.

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Product reveal test video.

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Another product-reveal variant from the same four-output batch.

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video

The horror batch was unusually consistent, with all four variants judged strong.

Bottom Line

Helpful because you can compare takes, but the best result is not always the first one.

From our researchearlier researchAutomatically Add Relevant Sound Effects to Videos

Background Music Layering

Solid

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Test Summary

Feature tested: Background Music Layering

Result: Passed — Solid

Feature tested: Background Music Layering

Result: Passed

Verdict: Solid

Expected behavior: Generates background music alongside sound effects while keeping the music from conflicting with the effects. The bird/nature test showed music that stayed out of the way of the sound design while adding atmosphere.

Test case: Video file → Video file

Input type: Video file

Input used: Input artifact (Video file): Input — Bird.mp4

Observed output: Output artifact (Video file): The bird/pipe clip included background music plus SFX, and the report said the music was consistently good across all four variants. — mirelo-bird-chirping-output-1.mp4

Input artifact: Input artifact (Video file): Input — Bird.mp4

Output artifact: Output artifact (Video file): The bird/pipe clip included background music plus SFX, and the report said the music was consistently good across all four variants. — mirelo-bird-chirping-output-1.mp4

What changed: Video file transformed into Video file

Test case: Video file → Video file

Input type: Video file

Input used: Input artifact (Video file): Input — Bird.mp4

Observed output: Output artifact (Video file): Background music across the bird/nature run stayed supportive and did not clash with the effects. — mirelo-bird-chirping-output-3.mp4

Input artifact: Input artifact (Video file): Input — Bird.mp4

Output artifact: Output artifact (Video file): Background music across the bird/nature run stayed supportive and did not clash with the effects. — mirelo-bird-chirping-output-3.mp4

What changed: Video file transformed into Video file

Test case: Video file → Video file

Input type: Video file

Input used: Input artifact (Video file): INPUT — Bird.mp4

Observed output: Output artifact (Video file): The bird/nature test combined effects with background music, and the reviewer said the music stayed consistently good across the batch. — mirelo-bird-chirping-output-2.mp4

Input artifact: Input artifact (Video file): INPUT — Bird.mp4

Output artifact: Output artifact (Video file): The bird/nature test combined effects with background music, and the reviewer said the music stayed consistently good across the batch. — mirelo-bird-chirping-output-2.mp4

What changed: Video file transformed into Video file

Test case: Video file → Video file

Input type: Video file

Input used: Input artifact (Video file): Bird / nature test video. — Bird.mp4

Observed output: Output artifact (Video file): Background music was attempted alongside SFX; the reviewer said the music across the four variants stayed consistently good. — mirelo-bird-chirping-output-4.mp4

Input artifact: Input artifact (Video file): Bird / nature test video. — Bird.mp4

Output artifact: Output artifact (Video file): Background music was attempted alongside SFX; the reviewer said the music across the four variants stayed consistently good. — mirelo-bird-chirping-output-4.mp4

What changed: Video file transformed into Video file

Test case: Text prompt → Text prompt

Input type: Text prompt

Input used: Input artifact (Text prompt): INPUT

Observed output: Output artifact (Text prompt): OUTPUT

Input artifact: Input artifact (Text prompt): INPUT

Output artifact: Output artifact (Text prompt): OUTPUT

What changed: Text prompt transformed into Text prompt

Why it matters / Conclusion: A solid extra layer for atmosphere, especially on nature footage.

Generates background music alongside sound effects while keeping the music from conflicting with the effects. The bird/nature test showed music that stayed out of the way of the sound design while adding atmosphere.

INPUT

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OUTPUT

The bird/pipe clip included background music plus SFX, and the report said the music was consistently good across all four variants.

video

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video

Background music across the bird/nature run stayed supportive and did not clash with the effects.

video

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video

The bird/nature test combined effects with background music, and the reviewer said the music stayed consistently good across the batch.

video

Bird / nature test video.

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video

Background music was attempted alongside SFX; the reviewer said the music across the four variants stayed consistently good.

INPUT

Adjust the music vibe after the bird/nature generation.

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OUTPUT

The report says users can change the music vibe by prompting further, which makes the music layer more flexible than a fixed background bed.

Bottom Line

A solid extra layer for atmosphere, especially on nature footage.

From our researchearlier researchAutomatically Add Relevant Sound Effects to Videos

Export and Download Options

Useful but limited

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Test Summary

Feature tested: Export and Download Options

Result: Partial — Useful but limited

Supports exporting the rendered video and downloading separate sound effects. The evidence mentions watermarked video exports on the free plan and watermark-free standalone SFX downloads.

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Export is available for the processed video, but the report notes that the free plan adds a watermark to video exports.

Bottom Line

Good if you can use the SFX download path, but the free-plan watermark makes video export less attractive.

From our researchAutomatically Add Relevant Sound Effects to Videosearlier research

Pricing & access

The report only documented free-tier access; it did not state any paid-plan pricing.

TESTED

Free tier

Free

Includes 2,400 credits. Each generation was described as costing roughly 20–30 credits. Video exports were watermarked, but SFX downloads were watermark-free.

Free-tier testing noted 2,400 credits, roughly 20–30 credits per generation, watermarked video exports, and watermark-free SFX downloads.

✓ Use This If

●You want automatic SFX on uploaded videos and can compare multiple variants.

●You want to rescue a weak first pass with prompt refinement.

●You want background music alongside effects in the same workflow.

●You can use watermark-free SFX downloads even if video exports are watermarked on the free tier.

✕ Skip This If

●You need a strong one-shot result with no iteration.

●You cannot review multiple variants.

●You need watermark-free video exports on the free plan.

●You need published paid pricing before choosing a tool.

audio-speechsound-effects-generatorvideo

On the product reveal, the first automatic pass was weak and poorly matched to the visuals. It needed a refined prompt before the result became usable.

Yes. The prompt "The sound effects are too filtered and hard. Add cinematic sound with detailing for each element." materially improved the product reveal by adding more cinematic detail and picking up small cues like a trailer-drop sound.

Yes. The bird/nature and horror tests each produced four variants, and the report says the best result was not always the first one.

Yes. In the bird/nature test, background music worked well alongside the sound effects and did not conflict with them.

Video exports are watermarked on the free plan, but SFX-only downloads are watermark-free. The report did not provide paid-plan pricing.

The horror scene was the standout. The report says all four variants were strong and that Mirelo captured footsteps, approach audio, and atmosphere with unusually high detail.