tenmei · terms of service

march 29, 2026

Tenmei is a spot light meter app for iOS developed by miraisoft. the app provides precision exposure metering, Zone System tools, reciprocity correction, and an exposure journal. all processing happens on your device.

Tenmei offers a free meter with an optional one-time purchase ("Tenmei Pro") that unlocks unlimited journal entries, reciprocity calculator, batch PDF export, and custom film stocks.

• the purchase is billed through your Apple ID account via the App Store
• it is a one-time, non-consumable purchase. no subscription, no recurring charges
• pricing: $5.99
• the purchase is family-shareable

miraisoft does not process payments directly. all billing is handled by Apple under their standard EULA.

journal entries, voice memos, and exposure data you create with Tenmei are yours. miraisoft does not access, collect, or claim any rights to your data. everything stays on your device.

Tenmei reads light through the iPhone's camera sensor. readings may differ from a dedicated spot meter because of the iPhone ISP's tone mapping. a calibration offset is provided for fine-tuning. miraisoft does not guarantee that readings will match any specific external device.

the Tenmei app, its metering logic, UI, and source code, is the property of miraisoft. you may not extract, reverse-engineer, or redistribute it.

Tenmei is provided "as is" without warranty of any kind. miraisoft does not guarantee that the app will be error-free or uninterrupted. trust your eyes. use the meter as a tool.

to the maximum extent permitted by law, miraisoft shall not be liable for any indirect, incidental, or consequential damages arising from your use of the app. this includes, but is not limited to, incorrect exposure data or missed shots.

these terms may be updated from time to time. changes will be posted at this URL with a revised date. continued use of the app after changes constitutes acceptance.

questions about these terms? reach me at hello@miraisoft.io.