# NanoRate vs Prometheus

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.

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.

## The numbers

| Metric | NanoRate | Prometheus |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/nanorate/id1321939806/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/prometheus-age-clock-and-timer/id6757980278/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | Free | Free |
| Size | 4 MB | 5 MB |
| Requires iOS | 17.6 | 17.6 |
| Devices | iPhone, iPad | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [恒俭 董](https://appshunter.io/developer/947356968) | [Wouter Stierhout](https://appshunter.io/developer/1454164937) |

## What reviewers say

### NanoRate

[App page](https://appshunter.io/ios/app/nanorate/id1321939806)

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.

**Highlights:** Multi-currency comparison, Historical date lookup, Fee-inclusive conversion, AR price scanning, Offline rate access, Home Screen widget

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| NanoRate Pro Unlock | $1.99 | one-time |


### Prometheus

[App page](https://appshunter.io/ios/app/prometheus-age-clock-and-timer/id6757980278)

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.

**Highlights:** Decimal age clock, Life milestone countdowns, Detailed life statistics, Apple Watch app and complications, Home and Lock Screen widgets, Live Activities support

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is NanoRate free?

NanoRate is free to download, with in-app purchases available.

### Is Prometheus free?

Prometheus is free to download, with no in-app purchases.

### Which has better reviews, NanoRate or Prometheus?

NanoRate and Prometheus are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do NanoRate or Prometheus have ads?

Neither NanoRate nor Prometheus shows ads.

### Which is updated more often, NanoRate or Prometheus?

NanoRate ships an update every 2 months, and Prometheus every 3 months. Most recently, NanoRate was updated on November 8, 2026 and Prometheus on October 19, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*