Light Meter LM vs Calsee

Turn your smartphone into a professional-grade light meter. Measure illuminance (lux/foot-candle) and color temperature (CCT in Kelvin) with unmatched accuracy — trusted by photographers, engineers, and lighting professionals worldwide. Why waste money on a hardware meter when you’re already carrying one in your pocket? The LM-3000 offers the same quality and usability as a traditional hardware light meter. Developed by optics scientists at the Zurich University of Applied Sciences, LM-3000 is the only light meter app scientifically validated for accuracy. It achieves professional-grade precision by leveraging your iPhone's front-facing camera sensor with advanced RAW image processing. Unlike relying on estimates like other apps, it adheres to the ISO/CIE 19476 standard, ensuring measurements you can trust for critical applications. MEASUREMENTS ⎷ Illuminance in lux or foot-candles ⎷ Correlated color temperature in kelvin FEATURES ⎷ Industry-leading accuracy, matching professional high-end lux meters ⎷ Pre-calibrated for your specific device ⎷ Excellent low light sensitivity to detect light pollution ⎷ No ads ⎷ No Bluetooth and location permission required ⎷ In-app manual ⎷ Save peak reading ⎷ HOLD function with acoustic signal ⎷ Custom calibration option to align readings to another meter DIFFUSER REQUIRED Like every real light meter, the LM-3000 requires a diffuser to measure accurately. A diffuser scatters incoming light evenly on the sensor and prevents hotspots. While it may sound complex, the solution is surprisingly easy. You have two options: 1) Easily build a diffuser yourself in less than a minute using standard printer paper. This is accurate enough for most use cases. 2) Get the dedicated Diffuser Accessory (free worldwide shipping) for best accuracy and convenience. More details on https://lightray.io/diffuser/ (!) Avoid apps that don’t require a diffuser! They are inaccurate because they ignore the basic physics of light measurement. TRY BEFORE YOU BUY The LM-3000 is free to download and comes with a free trial period. The trial period lasts for two non-consecutive days, giving you enough time to see if the app fits your needs. The status of your free trial will be shown as the "battery level" on the top right of the LM-3000's display and on the "Battery Status" screen. Once your light meter's "battery" is depleted, you may choose a Charging Option to keep using the app. You can pick what works best for you: → Single Charge — top-up for another 48 hours (perfect for occasional use), → Continuous Charging — a monthly subscription (great if you use it regularly), → Unlimited Battery — a one-time purchase for unlimited lifetime access LM-3000 is the result of over five years of dedicated research and development, ensuring you get a tool that is precise and reliable. Every in-app purchase supports future development and helps keep the app ad-free for everyone. As a member of 1% for the Planet, we donate at least one percent of all revenue to environmental non-profits — this is our way of giving back. ACCURACY Accuracy is not an afterthought — Apps developed by Lightray Innovation are developed according to the ISO/CIE 19476 standard. Thanks to RAW image processing and a default calibration per device model they’re able to match the performance of high quality traditional hardware light meters. To ensure quality we rigorously test our apps regularly on upcoming devices. DOWNLOAD FOR FREE. TRUSTED BY MILLIONS. LM-3000 is the go-to light meter for photographers, professionals, engineers, and lighting enthusiasts who rely on accurate measurements — not estimates or guesswork. Download for free today and experience the difference! See the app in action: https://youtu.be/EJW7NfE2qCk Terms and Conditions: https://lightray.io/lightmeter/terms/

Calsee is a calculator that never looks the same twice. Swipe across the display and a fresh theme appears, generated on your device in one of twelve styles: • Liquid Glass: translucent keys over a slowly drifting colour mesh, with a soft, jelly-like press • Neo-brutalism: flat poster colours, thick outlines and hard offset shadows • Material 3 Expressive: bold tonal colour and keys that change shape as you press • NeoPOP: a dark base, saturated colour and keys that drop into the case • Retro hardware: desk and pocket calculators with seven-segment LCDs or glowing vacuum-fluorescent displays • Neumorphism: soft, sculpted keys pressed out of one surface • Claymorphism: big, puffy pastel keys that squash when you press them • Y2K Aero: glossy gel buttons over a bright sky, or satin chrome and holographic foil • Paper & ink: hand-drawn keys on cream or graph paper, with a rubber-stamp equals key • Cyberpunk: dark plates with neon edges over a glowing grid • Vaporwave: pastel Win95 buttons and a striped sunset sinking into a neon grid • Bauhaus: red, yellow and blue blocks, discs and triangles on cream or black (off to start with: turn it on in Settings › Theme styles) Colour, key shape, type, press motion and sound all come from one seed, so there are millions of combinations, and hand-made hero themes turn up along the way. Every theme is checked for contrast before you see it, so the keys stay easy to read. Swipe back and the last theme returns exactly. The sum you were typing never moves. Underneath the themes it's a careful, accurate calculator: • Exact arithmetic: 0.1 + 0.2 = 0.3, and 1 ÷ 3 × 3 = 1 • Live result preview as you type, with a movable cursor for editing • Scientific mode: sin, cos and tan and their inverses, hyperbolic functions, logs, powers and roots, factorial, memory and DEG/RAD/GRAD, with a 2nd key for the inverse functions. Turn your phone sideways and the scientific keys appear. • Unit converter: length, weight, area, volume, temperature, speed, time, data, fuel economy, energy, power, pressure, force and angle, plus Indian units such as tola, gaj, guntha and bigha (by state). Every conversion factor is exact. • Currency converter for over 50 currencies, with ECB reference rates bundled in the app so it works offline. Rates are refreshed with each update. • Brackets and percent that work the way you expect • Hold any key to learn what it does, with a worked example you can watch • The amount in words under every result: "≈ 12.35 crore" at a glance, or every word with a tap. Lakh and crore or million and billion, in English or Hindi. • Number formats, including Indian lakh and crore grouping • History kept on your device for as long as you choose. Search it, add notes, pin favourites, export it as a spreadsheet (CSV), tap an entry to reuse it, or turn it off. • Business mode for shops and invoices: GST keys (5, 18 and 40%, or your own rates) with the CGST and SGST split, a running grand total, a 00 key, rounding to paise, and amounts in cheque wording: "Rupees … and … Paise Only" • 11 keystroke sound packs, from mechanical switches to a retro beep, matched to each theme or fixed to your favourite • Haptics tuned to each theme style, or switched off • Hardware keyboard support, with shortcuts to change the theme Make it yours: • Lock theme: found one you love? Swipes leave it alone. • Theme styles: choose which styles new themes come from. • Accessible themes: 7:1 contrast for maximum legibility. • Left-handed layout: = and the operators on the left, within reach of your thumb. • Reduce motion and one-handed mode. Liquid Glass switches to solid keys when your device asks for less transparency. Private by design: no ads, no accounts, no tracking, and nothing you type leaves your device. Calsee works completely offline. Theme sharing is coming in a future update.