NanoRate vs Prometheus
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
NanoRate
This utility app offers a straightforward way to convert currencies, supporting multiple currencies and historical data. It features AR price scanning and offline access for convenience.
- Multi-currency comparison
- Historical date lookup
- Fee-inclusive conversion
- AR price scanning
- Offline rate access
- Home Screen widget
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NanoRate is a lightweight currency converter for daily use. It supports base currency switching, multi-currency comparison, historical date lookup, fee-inclusive conversion, and trend view. You can also scan a price with AR camera and insert it directly into conversion. Rates are fetched from a public API, with local fallback reference data when offline. Home Screen widget is supported for quick checks.
Prometheus
Visualize your life as a continuously updating clock, down to 10 decimal places. Track unique milestones and explore life statistics. Available on iPhone and Apple Watch with customizable widgets and complications.
- Decimal age clock
- Life milestone countdowns
- Detailed life statistics
- Apple Watch app and complications
- Home and Lock Screen widgets
- Live Activities support
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Your time is precious. See it. Prometheus turns your age into a living clock, updating continuously to 10 decimal places. Count down to numbers you will only pass once, explore your life in weeks and statistics, and keep time visible across iPhone and Apple Watch. YOUR LIFE, LIVE • See your decimal age or a detailed breakdown of years, months, days, hours, minutes, and seconds • Count down to your billionth second, 10,000th day, next trip around the sun, and other once-in-a-lifetime milestones • Get an optional alert at the exact moment a milestone arrives • Explore estimated heartbeats and breaths, lunar cycles, distance traveled through space, and more • See your entire life as one dot for every week ON EVERY SCREEN • Apple Watch app and watch face complications • Home Screen and Lock Screen widgets • Live Activities on the Lock Screen and Dynamic Island • Shareable cards for Stories, Reels, and more SET UP ONCE Enter your birth date and time. Prometheus handles the rest. Your birth data stays on your devices, and no account or sign-in is required. Named after the Titan who gave humanity fire and knowledge, Prometheus is a reminder to see and use your most precious resource: time.
Screenshots
Verdict
The clearest difference is in-app purchases: Prometheus at none against NanoRate's 1. On price, rating, ratings volume and update cadence 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. NanoRate sells 1 one-off in-app purchase. Prometheus asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for NanoRate against 5.0 for Prometheus. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
NanoRate ships an update every 2 months, Prometheus every 3 months. The most recent releases landed on November 8, 2026 and October 19, 2026 respectively.
| Parameter | NanoRate | Prometheus |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Number of ratings | 1 | 1 |
| Update frequency | Every 2 months — better | Every 3 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, Apple Watch |
| Requires iOS | 17.6 | 17.6 |
| Further details — not scored | ||
| Size | 4 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | 恒俭 董 | Wouter Stierhout |
Customer experience
NanoRate
Prometheus
In-app purchases
NanoRate
- NanoRate Pro Unlock$1.99
Prometheus
No in-app purchases









