DateDiff vs KeepWaves
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DateDiff
Calculate the duration between two dates, with options to include or exclude weekends. It can also determine an end date based on a start date and a duration, or function as a countdown timer from today to a specific event.
- Calculate days between two dates
- Include or exclude weekends
- Calculate end date from start date and duration
- Countdown timer from today
- Pin start date as today
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An app for calculating the end of a license. It allows setting up the 2 dates and it will calculate how many days are in between, allowing ignore weekends or not. Also, it allows setting up a start date and a number of days and it will calculate the end date. Even more, it let you pin start date as always today to have a days countdown to a specific date.
KeepWaves
Transform audio recordings into visual art with customizable waveform visualizations. Capture high-quality sound, apply effects, and share your unique acoustic memories as audio, images, or videos. Preserve precious sounds in a way that engages both sight and hearing.
- Customizable waveform visualizations
- High-quality audio recording
- Real-time visualization
- Advanced audio processing
- Multiple export options (audio, image, video)
- Intuitive organization and search
- Interactive playback
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Record sound and turn it into a visual memory with KeepWaves. Capture audio, explore its waveform and customize how your recording looks when you share it. RECORD AND PLAY Record with adjustable sensitivity and gain. Play saved audio with waveform scrubbing and playback controls. MAKE IT YOURS Customize waveform colors, backgrounds and visual settings. Adjust your audio with the available processing controls and select the range you want to export. SAVE AND SHARE Organize and search saved recordings. Export audio, waveform images or videos to share through the apps you choose. KeepWaves Pro is required to make new recordings. Existing recordings remain available to play and export without an active subscription. Monthly and yearly subscriptions are available. Keep your own backups of important recordings. SUBSCRIPTION DETAILS The store shows the price, billing period and any eligible introductory offer before purchase. Payment is charged to your Apple Account at confirmation. Subscriptions renew automatically unless canceled before the renewal deadline shown by the store. Manage or cancel through your store subscription settings. Restore Purchases checks eligible existing access. Terms of Use: https://keepwaves.com/terms Privacy Policy: https://keepwaves.com/privacy
Screenshots
Verdict
The clearest difference is ads: KeepWaves at none against DateDiff's shown. KeepWaves also leads on monetization model (free vs ad-supported). DateDiff's advantage is update cadence (every 5 weeks vs every 19 months) and ratings volume (4 vs 1). On price, rating, in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for DateDiff against 5.0 for KeepWaves. Both are backed by a comparable volume of ratings — 4 and 1 respectively.
DateDiff ships an update every 5 weeks, KeepWaves every 19 months. The most recent releases landed on November 2, 2026 and October 30, 2026 respectively.
| Parameter | DateDiff | KeepWaves |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (4 ratings) | 5.0 (1 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 4 — better | 1 |
| Update frequency | Every 5 weeks — better | Every 19 months |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 52 MB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | David Vives | Arla Services |
Customer experience
DateDiff
KeepWaves
In-app purchases
DateDiff
No in-app purchases
KeepWaves
No in-app purchases
