One app for Indian families: your tree, your people, your calendar
Build a family tree that remembers tithis. Share the family phone list in one go. Get events that ring on everyone’s phone. And see your community’s own calendar, even offline, in 14 languages.
OIOA is for Android and iPhone. Store links appear here as soon as each listing is public.
English অসমীয়া العربية বাংলা ગુજરાતી हिन्दी ಕನ್ನಡ മലയാളം मराठी ଓଡ଼ିଆ ਪੰਜਾਬੀ தமிழ் తెలుగు اردو
What makes OIOA different
Plenty of apps show a calendar. OIOA is built around Indian families: the people, the dates they keep and the way they share.
- A family tree that knows tithisFather's name, birth, marriage and death tithis, 'born before 1960', and a traditional remembrance date. Relatives join as themselves.
- Share contacts in one goOne list for the family or group, straight into each member's phone book and kept up to date. Your own contacts are never touched.
- Events that ring for everyoneA puja, a meeting, the bus to the wedding: Family and Group events ring as alarms on members' phones.
- Your dates first, not English datesMonths in tithis, Hijri, Roj and Mah or Nanakshahi, with the English date alongside. Notes can repeat by your calendar.
- Works without the internetCalendars and timings are calculated or stored on your phone. Shared changes save offline and sync later.
- Cards for joy and for lossShok Sandesh, Shradhanjali and prayer meeting cards as well as weddings and festivals, in 13 languages.
Made for real family moments
A new daughter-in-law who needs everyone's number. A grandmother's birthday kept by tithi. A prayer meeting to announce. A society notice nobody reads. Here's how OIOA helps.
- Share family contacts in one goWhen someone joins the family or gets a new phone, they shouldn't have to collect forty numbers one by one. With OIOA, they get the whole family list in their Contacts app, and every future change too.
- Build a family tree togetherNo single person knows the whole family history. OIOA's Family Tree lets every branch add what it knows: Bua in Indore, Mama in Toronto, Dada's cousin in the village.
- Remember elders by tithiDadi's birthday was always on Kartik Shukla Panchami, not on a fixed English date. OIOA keeps those days in the calendar they belong to and reminds you before they come.
- Plan a wedding togetherMehendi at 4, sangeet at 8, the caterer's number, the decorator's number, the bus to the venue: an OIOA Group keeps every detail where the whole family can find it, and rings before each function.
- Condolence and prayer meeting cardsIn the hardest hours, someone has to tell everyone. OIOA helps you prepare a respectful Shok Sandesh or prayer meeting card in your language, and make sure relatives know when to gather.
- Housing society and community groupsThe plumber's number, the water-tank cleaning date, the AGM, the festival celebrations of every community: one OIOA Group keeps them in order, and admins decide who can post.
Why OIOA exists
OIOA is a humble attempt to bring all of India’s religions and communities under one roof, to show the brotherhood and shared belonging that is already part of everyday Indian life.
We started from the things Indian families do every day and few apps do well: keeping a grandparent’s birthday by tithi, passing the family’s phone numbers to a new member, telling everyone when the prayer meeting is, checking today’s Choghadiya or Fajr time with no signal. The result is one free app for all of it. Read why OIOA is different.
The app does not discriminate on religion, caste, creed, community, gender, language, region or colour. Every community in OIOA has its own Home screen, built with the same care and given the same place. None is primary, and none is an add-on. Family features are the same for everyone, so a family that spans communities can share one tree and one contact list.
We know we will not get everything right the first time. If something is missing or not quite right, please tell us what we missed, see the roadmap, or browse the communities in OIOA.
Choose your community
Each community has its own Home screen in OIOA, with the same care and the same depth. Pick one in Settings and change it whenever you like.
-
Hindu
Panchang, muhurat windows and a live Today card, worked out for where you are.- Panchang: tithi, 27 nakshatras, paksha, lunar month and Adhik maas
- Choghadiya, Hora, Rahu Kaal and Abhijit muhurat
- Sunrise and sunset for your location
-
Islamic
Prayer times, Jumma and Qibla direction, with the calculation method you follow.- Daily prayer times and Jumma
- Qibla direction from your location
- Karachi, Muslim World League and other accepted methods
-
Jain
The full panchang plus the 28 Jain nakshatras, Navkarshi and sect-aware calendars.- Everything in the panchang, plus the 28 Jain nakshatras
- Navkarshi time each morning
- Shwetamber, Digamber, Khartargachh, Sthanakwasi and other calendars
-
Parsi
Its own home screen, with Roj and Mah in the Shahenshahi, Kadmi or Fasli calendar.- A home screen of its own
- Shahenshahi, Kadmi and Fasli calendars
- The six Gahambars through the year
-
Sikh / Punjabi
Its own home screen, with the Nanakshahi calendar in the method you follow.- A home screen of its own
- Nanakshahi calendar, original 2003 version
- Nanakshahi calendar, SGPC method
Listed alphabetically. Don't see your community? Request it here.
How OIOA works
Pick your community and method
Hindu by regional profile, Islamic by method, Jain by sect, Parsi or Sikh/Punjabi. Home and the calendar adapt. Switch any time.
Bring your family in, if you like
Create an OIOA-ID to start a Family, a Family Tree or a Group, and invite relatives on WhatsApp. Calendars and tools need no account.
Works offline, shares on SYNC
Timings are calculated on your phone. Shared changes are saved locally and uploaded when you tap SYNC.
Everything else in the app
Daily timings for every community, plus everyday tools that are the same for everyone.
- PanchangTithi, nakshatra, yoga, karana and Adhik maas, by regional profile.
- ChoghadiyaDay and night Choghadiya, with time left in the one running now.
- Shubh YogaEvery Guru Pushya, Ravi Pushya and Amrit Siddhi in the year.
- Prayer times and QiblaOffline namaz times by your method, Sehri and Iftar, and Qibla.
- Navkarshi timesNavkarshi, Porshi and Purimaddha from your local sunrise.
- Zakat calculatorA private 2.5% Zakat estimate, calculated on your phone.
- Holidays and long weekendsNational, state and bank holidays, and a leave planner.
- RemindersBirthdays and remembrance days with alarms, repeating by tithi.
- GroupsSocieties, weddings, committees: updates, events and contacts.
- GST calculatorAdd GST to a price or find the GST inside one.
- Match-makingA traditional nakshatra comparison, with no invented score.
- Multi-languageThe whole app in English or your language.
Open to every community
If your community, sect or calendar method isn't in OIOA yet, or we have got something wrong, please tell us. Requests are read by a person, checked against sources, and the outcome is shown on the public roadmap.
Text version of this diagram
- You send a request: the community, what is missing, and a source if you have one.
- A person on the OIOA team reads it.
- We check sources, and ask community members where needed.
- We decide and tell you: added, corrected, or explained.
- The public roadmap is updated so everyone can see the outcome.
Understand the calendar you follow
- What is a tithi?A tithi is the time the Moon takes to gain 12° on the Sun. Learn how tithis are counted, why they vary in length, and what kshaya and vriddhi tithis are.
- Hijri vs GregorianHow the Hijri calendar differs from the Gregorian: lunar months, a 354-day year, why Ramadan moves 11 days earlier each year, and converting years.
- Navkarshi explainedWhat Navkarshi is, why it's 48 minutes after sunrise, how to work out Navkarshi time for your city, and related pachchakhan such as Porsi and Chauvihar.
- Parsi Roj and MahThe 30 Roj (day) names and 12 Mah (month) names of the Parsi calendar, the five Gatha days, and the jashans when a day and month share a name.
- Nanakshahi calendar historyThe Nanakshahi calendar's history: the Bikrami tradition, Pal Singh Purewal's design, adoption in 2003, the 2010 amendment, and why both are followed.
- Adhik maas explainedAdhik maas (Purushottam or Mal maas) is the extra lunar month that keeps the Hindu calendar with the seasons. How it's worked out and what it means.
Bring your family, and your calendar, into one app
Family Tree with tithis, shared contacts on every phone, events that ring for everyone, and your community's own calendar, offline. Free, with no paid features.
OIOA is for Android and iPhone. Store links appear here as soon as each listing is public.