Comparison

Epion vs Thirty Five mm

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

Head to head

Epion

Inzicht in luchtkwaliteit

Film photographer utilities

Free

🔧 Utilities

No ratingsView app →

About

Epion

Features

Read full description

Epion helps you monitor air quality in the office and at home. Use the app to connect your Epion Air to the local WiFi-network and view the collected statistics no matter where you are. Onze app maakt gebruik van enkele permissies: - Internet: de app zal verbinding maken met de systemen van Epion om je apparaten op te halen en informatie te tonen. - Camera: deze wordt enkel gebruikt om bij het toevoegen van een nieuw apparaat de QR-code op het apparaat te scannen. - Bluetooth, Locatie: de app zal met het apparaat verbinden over Bluetooth om de instellingen door te geven. Dit kan in principe gebruikt worden om je locatie te bepalen waardoor ook de 'locatie' permissie gevraagd kan worden. Onze app maakt enkel gebruik van Bluetooth wanneer je een apparaat aan het toevoegen bent, wij slaan geen locatiegegevens op.

About

Thirty Five mm

Features

Read full description

A toolbox for photographers shooting with and developing film on their own. It provides utilities for developing, metering or remembering locations to shot.

Screenshots

Epion4 screens

Thirty Five mm4 screens

Verdict

The call

Epion and Thirty Five mm are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Epion ships an update monthly, Thirty Five mm every 3 weeks. Both last shipped on October 25, 2026.

ScorecardNo meaningful differences

Epion versus Thirty Five mm: the parameters behind the verdict, then further details
Parameter	Epion	Thirty Five mm
Price	Free	Free
Update frequency	Monthly	Every 3 weeks — better
Ads	No	No
In-app purchases	No	No
Devices	iPhone, iPad, iPod	iPhone, iPad, iPod
Requires iOS	14.0 — better	15.6
Further details — not scored
Size	26 MB	36 MB
Age rating	4+	4+
Developer	SenseZo B.V.	Jan Loehr

In-app purchases

None

Epion

No in-app purchases

None

Thirty Five mm

No in-app purchases

Questions

Is Epion free?

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

Is Thirty Five mm free?

Thirty Five mm is free to download, with no in-app purchases.

Do Epion or Thirty Five mm have ads?

Neither Epion nor Thirty Five mm shows ads.

Which is updated more often, Epion or Thirty Five mm?

Epion ships an update monthly, and Thirty Five mm every 3 weeks. Most recently, Epion was updated on October 25, 2026 and Thirty Five mm on October 25, 2026.