Comparison

Slo vs Replay15

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Slo

Easily create slow-motion videos and fun photo strips. Save and share your creations directly to social media or your camera roll. Offers a free version with a watermark and an in-app purchase to remove it.

Highlights
  • Create slow-motion videos
  • Make fun photo strips
  • Save videos to camera roll
  • Share to Facebook and Instagram
  • Watermark removal via in-app purchase
Read full description

Use Slo-mo Booth to film your own slow motion videos and create fun photo strips. Slo-mo Booth makes it easy to save your videos to your camera roll and share on Facebook or Instagram right from the app. With a 5s or above, Slo-mo Booth shoots at a high frame rate, but plays back at the normal frame rate for great slow motion videos. For phones that don’t support high frame rate recording, Slo-mo Booth shoots at the normal frame rate and plays back at a slower frame rate to create slow motion GIF-like videos. Also just like a normal photo booth, you can create fun photo strips by using the photo feature to take four photos and save them into a classic photo strip. You can easily save them to your camera roll or share on Facebook or Instagram right from the app. The free version of Slo-mo Booth inserts a watermark on the video. Through an in-app purchase you can remove the watermark.

About

Replay15

This app acts as a continuous loop recorder, saving the last 15 seconds of video in slow motion. It's designed for capturing and instantly reviewing fast-paced action, allowing users to adjust playback speed for detailed analysis.

Highlights
  • Continuous loop recording
  • Instant slow-motion save
  • Adjustable slo-mo speed (30-240fps)
  • One-button operation
  • MP4 export
  • Real-time buffering
Features
Read full description

Replay15 Turn your phone into a personal slow-motion replay system. Requires phone with slow-motion video recording. How it works: Continuously records in loop, keeping last 15 seconds in memory. Tap Save to instantly save as slow-motion MP4 and open in video player. Simple & powerful: One-button control, no setup needed Starts buffering immediately Always ready to capture action Adjust slo-mo speed: 30fps (normal) to 240fps (8x slower) Perfect for: Sports: Review goals, fouls, calls like VAR system Racing: Capture photo-finish moments Martial arts: Relive knockouts, check punches Extreme sports: Instant replay without missing details Replay 15 - Save and review moments that matter.

Screenshots

Slo3 screens
Replay154 screens

Verdict

The call

The clearest difference is in-app purchases: Replay15 at none against Slo's 1. Replay15 also leads on update cadence (monthly vs every 2 months). Slo's advantage is ads (none vs shown) and iOS requirement (7.1 vs 15.6). On price, rating, ratings volume and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Slo sells 1 one-off in-app purchase. Replay15 asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 1.0 for Slo against 1.0 for Replay15. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

UpkeepUpdate frequency

Slo ships an update every 2 months, Replay15 monthly. The most recent releases landed on November 1, 2026 and November 5, 2026 respectively.

Scorecard5 real differences · 5 level
Slo versus Replay15: the parameters behind the verdict, then further details
ParameterSloReplay15
PriceFreeFree
Rating1.0 (2 ratings)1.0 (1 ratings)
Positive reviews50.0% of reviews—
Number of ratings2 — better1
Update frequencyEvery 2 monthsMonthly — better
AdsNo — betterYes
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesAd-supported — better
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS7.1 — better15.6
Further details — not scored
Size3 MB7 MB
Age rating4+4+
DeveloperRien HealdIURII VOEVODIN

In-app purchases

1 purchases

Slo

One-time1
  • Slo-mo Booth Premium$1.99
None

Replay15

No in-app purchases

Questions

Is Slo free?
Slo is free to download, with in-app purchases available.
Is Replay15 free?
Replay15 is free to download, with no in-app purchases.
Which has better reviews, Slo or Replay15?
Slo and Replay15 are both rated 1.0 out of 5 on the App Store, from 2 and 1 ratings respectively.
Do Slo or Replay15 have ads?
Replay15 shows ads; Slo does not.
Which is updated more often, Slo or Replay15?
Slo ships an update every 2 months, and Replay15 monthly. Most recently, Slo was updated on November 1, 2026 and Replay15 on November 5, 2026.

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