Ondaris
Comms, optics, photonics maths
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
66 calculators for communications, optics and photonics, each with its equation, assumptions, validity range and source. Free, with an optional one-time Pro purchase.
Ondaris is a calculation workspace for communications, optics and photonics: for engineers, students, researchers, lecturers and technicians who need the number and the working behind it.
Enter your parameters once and explore the whole system. Change the frequency and the wavelength, path loss, antenna aperture, Fresnel radius and Doppler shift all follow.
Every calculation shows its work. Tap through to the equation, what each symbol means, what the model assumes, where it stops being valid, and which document it came from. Export a PDF that carries all of it, so the person reading your report can check you.
WHAT IS INSIDE
66 calculators in five groups.
Converters: frequency and wavelength; W, dBm and dBW; ratio and decibels; VSWR, return loss and match; propagation delay.
RF and microwave: free-space path loss, link budget, microstrip line, Fresnel clearance, EIRP and power flux density, antenna gain and aperture, thermal noise, cascaded noise figure, receiver SNR and G/T, Shannon capacity, Doppler shift, rain attenuation, antenna patterns, arrays and Yagis, RF exposure limits, multipath fading, channel dispersion and coherence, phase noise to jitter, Allan deviation, and a Smith chart with L-network synthesis.
Link performance: bit error rate for M-PSK, square M-QAM and on-off keying, receiver sensitivity, fading channel capacity, the deterministic eye diagram, and how long a bit error rate test must run.
Optical: photon energy and rate, refraction and reflection at an interface, laser diode, detector responsivity, optical receiver SNR, APD and optimum gain, optically preamplified and coherent receivers, Gaussian beams, micro-ring resonator, fixed and flexible DWDM grids, FSO link budget, and FSO scintillation, turbulence fading and pointing error.
Fiber: power budget, V-number and guided modes, multimode modal bandwidth, mode field and joint loss, chromatic and polarisation mode dispersion, nonlinearity, four-wave mixing, OSNR of an amplified chain, and three measurements: dispersion fitted to group delay, OTDR splice loss, and OSNR on a spectrum analyser.
HOW IT WORKS
Every topic opens with the question it answers, why it matters and what the number means. Guided pathways walk you through designing a radio, free-space optical or fiber link, and measuring one.
Strict units: GHz or MHz, dBm or watts, kilometres or feet, all converted to SI, so the answer never depends on how you typed it.
Live recalculation, and plots you can scrub with the operating point marked.
Reverse solving on 62 of the 66 calculators: set the answer you need and the input follows.
Every answer ranks its inputs by influence, and turns tolerances you enter into an uncertainty on the result.
Projects that share parameters across calculators, with side-by-side scenario comparison.
PDF, CSV, LaTeX, Python and MATLAB export, carrying the assumptions, the validity range and the source clause with them.
Built for VoiceOver and Dynamic Type throughout: charts are spoken, not just drawn.
Every calculation runs offline. No account required. The only time Ondaris uses the network is to fetch the Pro price from the App Store and to buy, check or restore a purchase.
WHAT IT IS NOT
Ondaris is a calculation bench, not a simulator. Its models state their assumptions, and are closed-form where one exists and computed numerically, with independent checks, where it does not. It does not do full-wave electromagnetics, ray tracing or end-to-end system simulation.
Each formula carries its review status; 30 are approved by SCOPT Inc., with their limitations stated. That is an engineering review by the publisher, not certification by any standards body or test house.
No advertising. No tracking. No chatbot.
FREE AND PRO
Every formula page is free to read, and 28 calculators are free to use. Ondaris Pro, a one-time purchase, adds 38 specialist calculators, reverse solving beyond the converters, unlimited projects and export.
Developed by SCOPT Inc.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Nine new calculators. Antennas: the radiation patterns that are closed form,
drawn on a polar dial, a phased array with its grating lobes, a Yagi from
published measured designs, a helix, a parabolic reflector, a pyramidal horn
and a microstrip patch. And RF exposure to ICNIRP 2020 - the compliance
boundary, and the summation over several sources - both free, and both approved
for release.
Each says where its model stops, and refuses rather than answering outside it.
The developer, SCOPT Inc., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- SCOPT Inc.
- Size
- 54.7 MB
- Category
- Utilities
- Compatibility
Requires iOS 16.4 or later.
- iPhone
Requires iOS 16.4 or later. - iPad
Requires iPadOS 16.4 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Ondaris Pro $12.99
- Copyright
- © 2026 SCOPT Inc.