Comparison

Simplex vs SteerLog

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

Head to head
About

Simplex

Features
Read full description

Simplexβ„’ is a generic tool to support participative observation networks. The Simplexβ„’ smart app is one component of a more complete observation system that, in addition to the app, comprises a webGIS interface and a database. The application allows you to do any kind of thematic observation by driving the observers step by step, through explicit icons, to the right observation item, and to finally declare it (with our without photo) with geographical and spatial stamp. Observers have access at any time and any location to environmental data for the last three days that are extracted on-demand from environmental databases. At each observation are attached selected environmental parameters that allows, at any time, to correlate some observations with environmental context. Simplexβ„’ can host several observation networks, either of public type (i.e. open to anyone) or of private type. You can contract a license for a private one to create your own network. The license covers the configuration of the observation campaign (i.e. the selection and the hierarchy of icons and the required environmental parameters, if of interest to you). It also covers an access to a private webGIS that provides a synoptic view of the observation done by your network. Your data is kept safely on a private storage without any access by a third-party. Once created you can invite anyone you want to become an observer to your network. You can also easily change and adapt the icons at all time. The app allows on-line discussion (text) between network organizer and observers. Simplexβ„’ app is available in several languages (Arabic, English, French, German, Italian, Norwegian and Spanish). Want to create your own network or need for more information? Please contact simplex@acri.fr

About

SteerLog

Features
Read full description

Steerlog is the car maintenance log you'll still have in 15 years. Log any service, fill-up, or expense in seconds β€” and always know what's due next. No account. No ads. No subscription. No company server that can lose your records: everything lives on your phone and syncs privately through your own iCloud. Track every car you own, get reminded before the next oil change, and see what your car really costs. WHY DRIVERS SWITCH TO STEERLOG β€’ Your data is actually yours β€” stored on-device, synced to YOUR iCloud, never to our servers. Nothing to lose when an app shuts down. β€’ Buy once, own forever β€” a single one-time unlock for every extra car. No subscription, ever. Family Sharing included: one purchase covers your whole family, and each person keeps their own garage. β€’ Export is free, forever β€” CSV, PDF, and full backup files. Your history is portable on day one. EVERYTHING A CAR LOG SHOULD DO β€’ Log service, fuel, and expenses in seconds β€” odometer, cost, notes, receipts β€’ Service reminders by date AND mileage β€” "oil change in 800 mi" on your lock screen β€’ Home-screen widget with a live countdown to your next service β€’ Fuel economy (MPG or L/100km) calculated automatically from your fill-ups β€’ Charts: monthly spend, cost per mile, fuel economy over time (Pro adds Insights: forecasts & breakdowns) β€’ Full history with search and filters β€” 15 years from now, it's all still there β€’ Bring your history with you β€” import a CSV from another app or a spreadsheet, even when its dates were wiped: SteerLog places each service by odometer β€’ Notes on every car β€” the shop that knows it, quirks, the part to buy next β€’ Miles or kilometers, any currency FREE VS PRO Free: one vehicle with every feature above β€” full history, reminders, widget, charts, iCloud sync, backup, CSV/PDF export. Pro (one one-time purchase): unlimited vehicles, Insights (cost forecasts, year-over-year, spending breakdown), photo receipts, PDFs and documents in the glovebox, and maintenance schedule presets. That's the whole price list. Built by one person who was tired of car apps that lose people's records. Support: support@steerlog.app

Screenshots

Simplex4 screens
SteerLog4 screens

Verdict

The call

The clearest difference is in-app purchases: Simplex at none against SteerLog's 1. Simplex also leads on iOS requirement (9.0 vs 17.0). SteerLog's advantage is update cadence (weekly vs every 4 months). On price, 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. SteerLog sells 1 one-off in-app purchase. Simplex asks for nothing beyond the download.

UpkeepUpdate frequency

Simplex ships an update every 4 months, SteerLog weekly. The most recent releases landed on September 25, 2026 and September 17, 2026 respectively.

Scorecard3 real differences Β· 3 level
Simplex versus SteerLog: the parameters behind the verdict, then further details
ParameterSimplexSteerLog
PriceFreeFree
Update frequencyEvery 4 monthsWeekly β€” better
AdsNoNo
In-app purchasesNo β€” betterYes
DevicesiPhone, iPodiPhone, iPad
Requires iOS9.0 β€” better17.0
Further details β€” not scored
Size34 MB19 MB
Age rating4+4+
DeveloperACRIShakti Thakran

In-app purchases

None

Simplex

No in-app purchases

1 purchases

SteerLog

One-time1
  • SteerLog Pro$19.99

Questions

Is Simplex free?
Simplex is free to download, with no in-app purchases.
Is SteerLog free?
SteerLog is free to download, with in-app purchases available.
Do Simplex or SteerLog have ads?
Neither Simplex nor SteerLog shows ads.
Which is updated more often, Simplex or SteerLog?
Simplex ships an update every 4 months, and SteerLog weekly. Most recently, Simplex was updated on September 25, 2026 and SteerLog on September 17, 2026.

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