Comparison

zistemo vs PhosphorSSTV

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

Head to head
About

zistemo

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
Read full description

Zistemo is the smartest app for instant time tracking and expense tracking. Stay organized, boost productivity and save time with zistemo App. Choose the smartest way for Asana, Trello or Jira time tracking zistemo is the right solution for: - Project Manager - Solo freelancers and virtual workers - Business owners - Business freelance projects - Entrepreneurs - Large teams - Everyone who wants to be more productive and improve overall personal time management & effectiveness. Zistemo - Time tracking made easy Use our time tracking app to keep an eye on your business from any device connected to internet. Choose projects and tasks from the zistemo dropdown menu and create a new row for each new entry. Leave the math to us! - Track, log and invoice time on various projects & on specific tasks - Easily track time, create invoices and generate reports - Use the auto timing tool to log meetings and tasks which will be invoiced to your clients. - Monitor staff progress compared to KPIs and estimated time for tasks. As a flexible time management software designed for freelancers and small businesses, zistemo is as smart & fast as time tracking can be. Zistemo - Track expense entries on the go Wherever you are, take a photo of your receipts and zistemo will instantly attach them to your expense reports. - Simple & smart small business expense tracking - Go paperless with online expense tracking - All you have to do is: snap a photo… Done! Your expenses are safely stored on our cloud. - Keep good records by assigning tax-friendly categories to your expenses. - Tax-related business expenses will be automatically tracked and mapped to your tax form all year round. Zistemo app also offers: - simple and intuitive interface - automated timesheet template creation - friendly support team - timesheets and performance review on a weekly or monthly basis - detailed weekly timesheets - customized reports to help you make the right business decisions. No credit card required, no strings attached.

About

PhosphorSSTV

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
Read full description

PhosphorSSTV decodes Slow Scan Television (SSTV) signals in real time using your iPhone's microphone. SSTV has been the amateur radio image transmission mode since the 1960s. From cold-war era picture transmissions to International Space Station passes, SSTV encodes images as audio tones between 1200–2300Hz. Each scanline is a sweep through frequency space, painting pictures one line at a time across the HF bands. Hold your phone near a shortwave radio tuned to an SSTV signal β€” or play a recording β€” and watch the image build scanline by scanline on an authentic phosphor CRT display, just like the original SSTV monitors. No internet connection required. No external hardware. No account. Just your iPhone and a radio. TEN SSTV MODES β€’ Scottie S1, S2, DX β€” the most widely used SSTV modes on HF worldwide β€’ Martin M1, M2 β€” popular across European SSTV activity β€’ Robot 36, 72 β€” YCbCr colour modes, used by the ISS during special events β€’ Robot 8, 12, 24 BW β€” fast greyscale modes for text, diagrams, and low-bandwidth conditions REAL-TIME DECODING β€’ Progressive scanline rendering β€” the image builds top to bottom, just like a real SSTV monitor β€’ VIS code detection automatically identifies the transmission mode β€’ Sync-aligned slant correction eliminates timing drift for straight, clean images β€’ Hilbert transform FM discriminator for accurate frequency-to-pixel conversion SIGNAL ANALYSIS β€’ Live FFT spectrum display shows the full 0–4 kHz audio band β€’ Scrolling waterfall reveals the SSTV signal structure in real time β€’ SSTV band markers at 1200 Hz (sync), 1500 Hz (black), and 2300 Hz (white) β€’ Input gain control from 0.1Γ— to 20Γ— IMAGE LOG β€’ Decoded images saved automatically with thumbnails β€’ Full metadata: mode, timestamp, duration, VIS detection status β€’ View full-size, share, or delete β€’ Swipe to delete, tap to view detail AUTHENTIC CRT AESTHETIC β€’ Green and amber phosphor display themes β€’ Scanline overlay, vignette, and glow effects β€’ Monospaced terminal typography throughout β€’ The same retro aesthetic as our PhosphorRTTY and PhosphorCW apps WHERE TO FIND SSTV β€’ 20m band: 14.230 MHz USB β€” primary worldwide SSTV frequency β€’ 80m band: 3.845 MHz LSB β€’ 40m band: 7.171 MHz LSB β€’ ISS: 145.800 MHz FM during special SSTV events β€’ Or search YouTube/archive.org for SSTV audio recordings to decode PRIVACY PhosphorSSTV makes zero network requests. No accounts, no tracking, no analytics, no ads. Microphone audio is processed entirely on-device and is never recorded or transmitted. See our full privacy policy on our support page. ABOUT SSTV Slow Scan Television was developed in the late 1950s as a way to transmit still images over voice-bandwidth radio channels. Unlike fast-scan television (broadcast TV), SSTV takes seconds to minutes per image, encoding pixel brightness as audio frequency. The 1200 Hz sync pulse marks each line boundary, black is 1500 Hz, and white is 2300 Hz. Every pixel in between is a precise frequency in that range. Amateur radio operators worldwide still use SSTV daily on the HF bands, and the International Space Station periodically transmits commemorative images that can be received with nothing more than a handheld radio.

Screenshots

zistemo4 screens
PhosphorSSTV4 screens

Verdict

The call

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.

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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

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

UpkeepUpdate frequency

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

Scorecard5 real differences Β· 3 level
zistemo versus PhosphorSSTV: the parameters behind the verdict, then further details
ParameterzistemoPhosphorSSTV
PriceFree β€” better$0.99
Positive reviews50.0% of reviews β€” better0.0% of reviews
Update frequencyMonthly β€” betterEvery 3 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree β€” betterPaid
DevicesiPhone, iPod β€” betteriPhone
Requires iOS15.0 β€” better18.0
Further details β€” not scored
Size45 MB3 MB
Age rating4+4+
DeveloperDAYquiri GmbHStuart Woolley

Customer experience

zistemo

Written reviews4 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

PhosphorSSTV

Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

zistemo

No in-app purchases

None

PhosphorSSTV

No in-app purchases

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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