# zistemo vs PhosphorSSTV

The clearest difference is review sentiment: zistemo at 50% against PhosphorSSTV's 0%. zistemo also leads on price (Free vs $0.99) and update cadence (monthly vs every 3 months). On ads, in-app purchases and device support there is nothing between them.

zistemo is free to download; PhosphorSSTV costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

zistemo ships an update monthly, PhosphorSSTV every 3 months. The most recent releases landed on November 6, 2026 and November 13, 2026 respectively.

## The numbers

| Metric | zistemo | PhosphorSSTV |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Positive reviews | **50.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 3 months |
| Monetization | **Free** | Paid |
| Size | 45 MB | 3 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [DAYquiri GmbH](https://appshunter.io/developer/579268966) | [Stuart Woolley](https://appshunter.io/developer/315697638) |

## What reviewers say

### zistemo

[App page](https://appshunter.io/ios/app/zistemo-time-tracking/id1058504772)

This app offers instant time and expense tracking for businesses and freelancers. It helps users stay organized, boost productivity, and manage projects, tasks, and client invoices efficiently. Users can also track expenses by snapping photos of receipts and assigning tax categories.

**Highlights:** Instant time tracking, Expense tracking with receipt photos, Project and task logging, Invoice generation, Automated timesheet creation, Customized business reports, Staff progress monitoring

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

**In-app purchases:** none


### PhosphorSSTV

[App page](https://appshunter.io/ios/app/phosphorsstv/id6761005542)

Decode Slow Scan Television (SSTV) signals in real time using your iPhone's microphone. This app transforms audio tones into images, recreating the retro aesthetic of vintage monitors. It supports ten SSTV modes and offers advanced signal analysis tools.

**Highlights:** Real-time SSTV signal decoding, Supports ten SSTV modes, Authentic CRT display aesthetic, Live FFT spectrum analysis, Automatic VIS code detection, Image logging with metadata

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

**In-app purchases:** none


## Frequently asked questions

### Is zistemo free?

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

### Is PhosphorSSTV free?

PhosphorSSTV costs $0.99, with no in-app purchases.

### Do zistemo or PhosphorSSTV have ads?

Neither zistemo nor PhosphorSSTV shows ads.

### Which is updated more often, zistemo or PhosphorSSTV?

zistemo ships an update monthly, and PhosphorSSTV every 3 months. Most recently, zistemo was updated on November 6, 2026 and PhosphorSSTV on November 13, 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.*