Comparison

Contrigraph vs EVA Clock Nixie

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

Head to head
About

Contrigraph

Features
Read full description

Grow your grass. That's the whole app. "Contrigraph" is short for contribution graph β€” the GitHub habit of watching squares turn green as you show up. This app takes that feeling and points it at exactly one habit. β–  One habit, on purpose This isn't a multi-habit dashboard. Running, reading, lifting β€” pick one and track only that. Fewer things to manage is why it sticks. β–  A year-long strip to read your rhythm The band across the top isn't for reading any single day β€” it's texture. Glance at it and you can tell when you were on a roll and when things slipped, all year at once. Tap it to jump to that month. β–  A month calendar to look back and fix things The calendar is where the real reading (and rewriting) happens. Tap any day, past or present, and cycle its effort. Five honest levels β€” not counted, not measured: none, a little, okay, solid, perfect. β–  One big button for today No hunting through a grid. Today gets its own button. β–  A nudge only when you'd actually forget Notifications fire only on days you haven't logged yet, and you can log right from the notification. If a streak is alive, a second "before it breaks" reminder follows later in the day. ・Fully localized in English and Japanese ・Dark mode and Dynamic Type support ・Free, with a banner ad No motivation speech required. Just tap today's square.

About

EVA Clock Nixie

Features
Read full description

A nixie tube clock for your iPhone or iPad. The glowing orange digits are not photographs. Every bend of every numeral, and every wire stacked behind it, is drawn from scratch. Each digit is built as a single bent wire, and three layers - bloom, midtone, and glowing core - stack up to make that particular orange light. The digits that are not lit are still there, as a faint stack of ten numeral-shaped cathodes behind the glowing one. As the time changes, lit and unlit tubes quietly trade places. Turn the device sideways and the tubes fill the screen. It is meant to sit on your nightstand or desk as the clock itself. WHAT IT DOES - Home Screen widgets showing hours and minutes, in a small square or a wide rectangle - they work in StandBy too - Switch between 12-hour and 24-hour display - Hourly chime, with a three-second countdown tone and adjustable volume (it respects the silent switch) - Keep the screen awake while the clock is showing - Dim the display for night use - Protect OLED displays by shifting the clock a few points every few minutes ABOUT THE WIDGET It sits on your Home Screen or in StandBy. It shows hours and minutes; seconds do not move. iOS decides when widgets refresh, so the displayed time may lag slightly behind. Lock Screen widgets are not supported - the Lock Screen renders widgets without color, and nixie tubes do not survive that. USING IT Tap the screen to open the settings. There are no other buttons - you get the clock and nothing else. PRIVACY This app collects nothing. No analytics, no crash reporting, no advertising. It performs no network communication at all. Your settings are stored only on your device. REQUIREMENTS iOS 17.0 or later / iPadOS 17.0 or later Also available for Mac under the same name.

Screenshots

Contrigraph4 screens
EVA Clock Nixie2 screens

Verdict

The call

The clearest difference is in-app purchases: EVA Clock Nixie at none against Contrigraph's 1. On price, update cadence, ads 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

Both are free to download. Contrigraph sells 1 one-off in-app purchase. EVA Clock Nixie asks for nothing beyond the download.

UpkeepUpdate frequency

Contrigraph ships an update every 6 days, EVA Clock Nixie every 5 days. The most recent releases landed on October 6, 2026 and October 15, 2026 respectively.

Scorecard1 real difference Β· 5 level
Contrigraph versus EVA Clock Nixie: the parameters behind the verdict, then further details
ParameterContrigraphEVA Clock Nixie
PriceFreeFree
Update frequencyEvery 6 daysEvery 5 days β€” better
AdsNoNo
In-app purchasesYesNo β€” better
DevicesiPhone, iPadiPhone, iPad, Mac β€” better
Requires iOS17.517.0 β€” better
Further details β€” not scored
Size10 MB5 MB
Age rating4+4+
DeveloperHajime NakamuraFutoshi Ebata

In-app purchases

1 purchases

Contrigraph

One-time1
  • Remove Ads$1.99
None

EVA Clock Nixie

No in-app purchases

Questions

Is Contrigraph free?
Contrigraph is free to download, with in-app purchases available.
Is EVA Clock Nixie free?
EVA Clock Nixie is free to download, with no in-app purchases.
Do Contrigraph or EVA Clock Nixie have ads?
Neither Contrigraph nor EVA Clock Nixie shows ads.
Which is updated more often, Contrigraph or EVA Clock Nixie?
Contrigraph ships an update every 6 days, and EVA Clock Nixie every 5 days. Most recently, Contrigraph was updated on October 6, 2026 and EVA Clock Nixie on October 15, 2026.

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