Exhibit 31.1



CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER AND PRINCIPAL FINANCIAL OFFICER



I, Harry E. Gruber, M.D., President and Chief Executive Officer of Kintera, Inc. (the
Registrant), certify that:



1. I have reviewed this quarterly
report on Form 10-Q of the Registrant;



2. Based on my knowledge, this
quarterly report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the
period covered by this quarterly report;



3. Based on my knowledge, the
financial statements, and other financial information included in this quarterly report, fairly present in all material respects the financial condition, results of operations and cash flows of the Registrant as of, and for, the periods presented in
this quarterly report;



4. I am responsible for establishing and maintaining
disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the Registrant and I have:



(a) designed such disclosure controls and procedures, or caused such disclosure controls and
procedures to be designed under my supervision, to ensure that material information relating to the Registrant, including its consolidated subsidiaries, is made known to me by others within those entities, particularly during the period in which
this quarterly report is being prepared;



(b) Designed such internal control
over financial reporting, or caused such internal control over financial reporting to be designed under my supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for
external purposes in accordance with generally accepted accounting principles;



(c) evaluated the effectiveness of the Registrants disclosure controls and procedures and presented in this quarterly report my conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period
covered by this report based on such evaluation; and



(d) disclosed in this
quarterly report any change in the Registrants internal control over financial reporting that occurred during the Registrants most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the
Registrants internal control over financial reporting; and



5. I have
disclosed, based on my most recent evaluation of internal control over financial reporting, to the Registrants auditors and the audit committee of Registrants board of directors:



(a) all significant deficiencies and material weaknesses in the design or operation of
internal controls over financial reporting which are reasonably likely to adversely affect the Registrants ability to record, process, summarize and report financial information; and



(b) any fraud, whether or not material, that involves management or other employees who have
a significant role in the Registrants internal controls over financial reporting.



Dated: May 10, 2005

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|/s/ Harry E. Gruber, M.D.                                    
|Harry E. Gruber, M.D.                                        
|President and Chief Executive Officer                        
|(Principal Executive Officer and Principal Financial Officer)