A cloud-native alternative to RTKLIB
Bring observation conversion, quality checks and positioning tasks into one workspace. Choose your processing settings, track each run and review the resulting report.
Processing needs an account. This panel is a first step: it checks your file and needs no account.
Explore PosFlow WorkspaceQuick check, no account
Upload an observation file or open a sample to see its quality score and key findings.
One file up to 100 MB (20 MB gzipped), ten checks per day. The file is deleted as soon as the result is ready.
Choose a file first
No file? Use a public station
Opens a stored example result straight away and does not use one of your daily checks.
Fetches a station's daily observation file from the public archives and checks it. It needs the person check above and uses one of your daily checks.
Why surveyors seek an RTKLIB alternative
A browser workspace can make it easier to move between conversion, quality checks and positioning, while keeping task history and reports together. Review the supported inputs and processing conditions before choosing a workflow.
PosFlow vs RTKLIB capabilities
- Browser workflow: Start processing without installing a local GNSS application
- Ephemeris retrieval: Find the orbit and clock products needed by your processing workflow
- Server processing: Review the file-size limits and processing allowance for your plan
- Unified multi-vendor converter: Replaces CONVBIN with native support for u-blox, Septentrio, Trimble, Leica, Topcon, and NovAtel
- Four quality-check modes (Fast, Flash, Full, TEQC): 0-100 scoring replacing manual text parsing and fragmented plots
- Precise positioning: PPP, PPK and network adjustment, plus Apex Duo, which compares two independent processing engines on static PPP and static network data
- Team collaboration & shareable links: Cloud deliverables, PDF summaries, and CSV/Excel exports
What each result shows
Each Apex result lists its inputs and the processing configuration it used: reference frame, products, elevation cutoff and models. Static solutions report a formal standard deviation for each coordinate; PPK trajectories report per-epoch sigmas, residual plots and a satellite timeline.
How to transition from RTKLIB to PosFlow cloud workspace
Step-by-step workflow to convert raw GNSS observations and compute precise positioning, with nothing to install.
Convert raw logs with Flux
Upload raw receiver logs to automatically convert to clean RINEX 3 without using command-line CONVBIN.
Inspect data health with Crux
Run multi-GNSS quality scoring to detect cycle slips, multipath, and SNR anomalies before processing.
Compute baseline with Apex
Submit static or kinematic post-processing jobs with automated ephemeris fetching and antenna calibration.
Export results and reports
Download coordinate solutions, inspection charts, and publication-ready PDF reports.
What won't produce a result
Worth checking before you upload, so a run doesn't cost you credits to tell you what your data was missing.
Base and rover observation files that were not recorded over the same time window
Base and rover logs with an overlapping observation span. A baseline can only be solved for the period both receivers were logging at once.
Only one receiver's log, with no second station to differentiate against
Both a rover log and a base station log. A single-receiver file has no second point to form a baseline against.
A base station whose coordinates are unknown
At least an approximate known position for the base. Without one, the solved baseline vector has no reference frame to be reported in.
Common questions
Can PosFlow process kinematic rover data against a base station like RTKPOST?
Yes. Apex PPK accepts rover and base station RINEX files to compute kinematic trajectories and static baseline vectors with customizable elevation masks and antenna models.
Does PosFlow support raw binary conversion like CONVBIN?
Yes. Flux converts raw binary logs from u-blox (.ubx), Septentrio (.sbf), Trimble (.t02/.dat), and other manufacturers into clean RINEX 2, 3, or 4.
Can I use PosFlow for free?
Yes. The Free plan includes 25 credits per month (5 Fast Mode analyses, or 25 conversions), with up to 100 MB per file, no credit card required.
Standards & Specifications
A free account covers files up to 100 MB. No card required. View plans and usage costs
Explore PosFlow Workspace